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Qualities to Look For in Aquascaping Fish
Selecting fish for carefully aquascaped aquariums isn’t always as simple as going to you local fish store and picking out whatever catches you eye.
Here are a few qualities that you should look for when choosing fish:
Small to Medium Sized
The vast majority of fish used for planted aquascapes are on the small end of the spectrum. Schools of 1 to 2 inch Tetras, Danios, and Rasboras work well because they provide a burst of color while having no impact on plants beyond a bit of extra CO2 and nitrogenous fertilizer.
Small fish are also less in competition with the design of your aquascape for the viewer’s attention. Hence modest schools of 1-inch Neon Tetras are regularly kept even in 100+ gallon Nature and Iwagumi-style aquascapes, which place a ton of focus on the placement of plants, rocks, and substrate.
Sociability
Planted aquascapes tend to be either community tanks or aquariums dedicated to a single species of fish. Both schooling and solo fish can be kept together. In fact, I recommend it, as schools of small fish soothe the anxieties of solo species by acting as dither fish.
However schools of small fish help give a planted aquascape a busier feel if that’s the aesthetic you’re aiming for. And they have the least impact on the bioload and nutrient cycles of the tank.
Plant Safe
Larger fish sometimes bring in bad habits like digging and uprooting them (Goldfish, Cichlids, Catfish especially) or may simply find plants delicious. Choose fish that are small, mostly carnivorous, and spawn by scattering eggs. Nest builders sometimes collect plant leaves or dig into the substrate, which can disturb plant roots.
The 10 Best Aquascaping Fish For Your Aquarium
Neon Tetras or Black Neon Tetra.
Harlequin Tetras (Harlquin Rasbora)
Rainbows.
Angel Fish.
Discus.
Guppys.
Chili Rasbora / Mosquito Rasbora.
Dwarf Gourami
TETRA
Tetras regularly top most lists of the best aquascaping fish because they have all of the qualities we’re looking for. They are nearly all carnivorous, small, schooling, and have bright colors that nicely complement the greens, dark reds, and browns of an aquascape.
There are dozens of species commonly found in the trade and hundreds all over the world. The vast majority come from South America, with a few African species like the Congo Tetra (Phenacogrammus interruptus) available on occasion.
As a group Tetras prefer soft, acidic water (pH 6.5 to 7.0) and temperatures on the warmer side (75-80F). Tank bred species like Neon Tetras are very flexible however providing these conditions results in not only good health but potential breeding!
Recommended Species: Neon Tetra (Paracheirodon innesi), Cardinal Tetra (Paracheirodon axelrodi), Gold Tetra (Hemigrammus rodwayi), Rummy Nose Tetra (Hemigrammus rhodostomus), Serpae Tetra (Hyphessobrycon eques), Marbled Hatchetfish (Carnegiella strigata)
Average Size: 1 to 2 inches
Minimum Aquarium Size: 5 gallons
Ease of Care: Very Easy
RASBORAS
Rasboras fill the same niche as Tetras in Asia: small, schooling fish that feed on tiny prey items. They are Cyprinids which makes them close cousins to Barbs, Danios, and Goldfish.
The Chili Rasbora (Boraras brigittae) is especially dear to blackwater aquascapers (pH 4.0-5.5). At less than an inch in length they are perfect for nearly any aquarium size. Yet they never fail to attract attention thanks to their vibrant scarlet tones and active disposition.
Since they aren’t as well known as Tetras, Danios, and other small schooling fish, Rasboras often get passed up by aquarists. Which is a shame because they rarely show their best color in aquarium stores.
When placed in planted aquascapes with full spectrum light, plenty of cover, and dark substrates they take on rich red and purple tones. And when male Rasboras display for the attention of females they become even more vibrant!
Recommended Species: Chili Rasbora (Boraras brigittae), Harlequin Rasbora (Trigonostigma heteromorpha), Scissortail Rasbora (Rasbora trilineata)
Average Size: ½ to 2 inches
Minimum Aquarium Size: 5 Gallons
Ease of Care: Very Easy
LIVEBEARERS
Guppies, Platies, Swordtails, and Mollies do just as well in planted aquascapes as they do in community aquariums. Live plants also offer their babies a better chance to survive, especially if you keep weedy plants like Java Moss or Micro Sword Plants.
Mollies should be treated with caution, however. They will eat soft bodied plants like Elodea as well as macroalgae. And their need for salt may not work for many freshwater plants.
Livebearers as a whole also prefer neutral to slightly alkaline water conditions (pH 7.0-8.0). Aquascapes with limestone, Seiryu, and other stones rich in carbonate and minerals help maintain conditions to their liking!